batman-adv: add sanity check when removing global tts

After removing the batman-adv module, the hash may be already gone
when tt_global_del_orig() tries to clean the hash. This patch adds
a sanity check to avoid this.

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Tested-by: Alexey Fisher <bug-track@fisher-privat.net>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index ca537ed2dd0a650b580df5470324c84ea5bc430b..d58fd8b9c818008b57d65a15cf65fa1841f1bba2 100644 (file)
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -698,6 +698,9 @@ void tt_global_del_orig(struct bat_priv *bat_priv,
        struct hlist_head *head;
        spinlock_t *list_lock; /* protects write access to the hash lists */
 
+       if (!hash)
+               return;
+
        for (i = 0; i < hash->size; i++) {
                head = &hash->table[i];
                list_lock = &hash->list_locks[i];